检索结果-南通市图书馆

Note about Fixed points of Scott Continuous Self-Mappings

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical research and Exposition 2011年第1期31卷 187-190页

作者： Xiao Yong XI1,2,Yong Ming LI3 1.college of Mathematics and Information science,shaanxi normal university,shaanxi 710062,{4. 2.college of Mathematics science,Xuzhou normal university,Jiangsu 221009,{4. 3.college of computer science,shaanxi normal university,shaanxi 710062,{4. college of Mathematics and Info'rmatio'n science Shaanxi Normat University Shaanxi 710062 college of computer science Shaanxi Normal University Shaanxi 710062

It is discussed in this paper that under what conditions, for a continuous domain L, there is a Scott continuous self-mapping f ： L → L such that the set of fixed points fix（f） is not continuous in the ordering induced by L. For any algebraic domain L with a countable base and a smallest element, the problem presented by Huth is partially solved. Also, an example is given and shows that there is a bounded complete domain L such that for any Scott continuous stable self-mapping f, fix（f） is not the retract of L.

关键词： Scott continuous fixed points stable mapping.

Land Use/Land Cover Change(LUCC) and Eco-Environment response to LUCC in Farming-pastoral Zone,china

在线全文

学校读者我要写书评

暂无评论

Agricultural sciences in china 2009年第1期8卷 91-97页

作者： HAO Hui-mei and rEN Zhi-yuan college of Tourism and Environmental science,shaanxi normal university,Xi’an 710062,p.r.china college of Tourism and Environmental science Shaanxi Normal University Xi'an 710062 P. R. China

In order to understand land use/land cover changes （LUCC） and the eco-environment response to LUCC in farming- pastoral zone of the northern china during the recent twenty years, Baotou prefecture was selected as a case study area for investigation and quantitative evaluation. Technologies of remote sensing （rS）, global positioning system （GpS）, geographic information system （GIS）, and other statistical methods were employed to implement. results showed that：（1） During the recent twenty years, the areas of forest lands, grasslands and water were reduced, whereas the areas of other types were enlarged. parts of forest lands, grasslands, and waters had become farmlands, and about 31.5% of the changed grasslands transferred into unused lands. The newly increased farmlands mainly came from grasslands and unused lands. And the newly increased construction lands mainly came from grasslands and farmlands. （2） regional eco- environmental quality decreased by 12.6%, for which the land degradation （especially the meadow degeneration） and the developing of the cultivated land were mainly responsible, and their contributions to the regional eco-environment changes were 51.84.and 23.63% respectively. （3） The tendency of LUCC and the eco-environment response to LUCC displayed spatial heterogeneity. It can be concluded that the present agricultural production mode was not sustainable in farming-pastoral zone of northern china. Land degradation, especially meadow degradation induced by over-trampling and overgrazing, and developing of cultivated land were mainly responsible for regional eco-environment deterioration. Changing the cultivated land to forest or grass, however, can relieve deterioration of local eco-environment to some extents. And in the farming-pastoral zone in the northern china, evaluating regional eco-environment responses to LUCC was very necessary due to its fragile eco-environments.

关键词： farming-pastoral zone LUCC eco-environment responses to LUCC

Effects of ABA Content on the Development of Abscission Zone and Berry Falling After Harvesting of Grapes

在线全文

学校读者我要写书评

暂无评论

Agricultural sciences in china 2009年第1期8卷 59-67页

作者： ZHANG You-lin and ZHANG run-guang college of Food Engineering and Nutritional science,shaanxi normal university,Xi’an 710062,p.r.china college of Food Engineering and Nutritional science Shaanxi Normal University Xi'an 710062 P. R. China

The commodity price of grape reduces as berry falling after harvest. It is crucial to prevent grape from berry falling during storage. In this article, the structure change of grape cells in the abscission zone was observed, the ABA content and the activities of cellulase and polygalacturonase （pG） were measured, and the relationship of ABA and berry falling was investigated. The results suggest that cells in the abscission zone grow into a separation layer soon after the grapes are cut off. According to the level of development, we designed 6 grades to sort the different development stages. The grade 3 plays an important role in berry falling. ABA enhances the activities of cellulase and polygalacturonase, and accelerates the decomposition of cellulose and pectin, which determines the level of development of abscission zone and berry falling. If ABA ratio is less than 20 ng g-i flesh weight （FW）, the abscission zone is not developed to the grade 3, and the berry falling is effectively stopped. We treated grape bunches with nine plant growth regulators and two chemicals. The results indicated that 2,3,5-triiodobenzoic acid （TIBA） can （a） inhibit the generation of ABA significantly, （b） inactivate the activities of cellulase and pG, （c） delay the development of the grade 3 of abscission zone, and （d） stop berry falling. Indole acetic acid （IAA）, gibberellic acid （GA3）, naphthalene acetic acid （NAA）, 6-benzylaminopurine （6-BA）, calcium chloride （CaCl2）, and potassium permanganate （KMnO4. caused similar results as TIBA. Chlorocholine chloride （CCC）, dimethyl amino succinamic acid （B9）, chloroethylphosphonic acid （CEpA） and exogenous ABA showed opposite effects.

关键词： grape phytohormone enzyme berry falling

property(ω) and Its perturbations

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical research with Applications 2012年第4期32卷 450-458页

作者： Qiaoling XIN,Xiaohong CAO college of Mathematics and Information science,shaanxi normal university,shaanxi 710062,{4. college of Mathematics and Information science Shaanxi Normal University Shaanxi 710062

In the note,we establish for a bounded linear operator defined on a Hilbert space the necessary and sufficient conditions for the stability of property(ω) by means of the variant of the essential approximate point spectrum and the induced spectrum of consistency in Fredholm and *** addition,the stability of property(ω) for H(p) operators is considered.

关键词： property(ω) perturbation consistency in Fredholm and index.

Duality properties between spectra and tilings

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china Mathematics 2010年第5期53卷 270-280页

作者： LI JianLin college of Mathematics and Information science,shaanxi normal university,Xi’an 710062,china college of Mathematics and Information science Shaanxi Normal University Xi’an China

Spectra and tilings play an important role in analysis and geometry *** relations between spectra and tilings have bafied the mathematicians for a long *** conjectures,such as the Fuglede conjecture,are placed on the establishment of relations between spectra and tilings,although there are no desired *** the present paper we derive some characteristic properties of spectra and tilings which highlight certain duality properties between them.

关键词： spectral pair periodic set packing and covering tiling pair

Borel probabilistic and quantitative logic

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2011年第9期54卷 1843-1854页

作者： ZHOU HongJun & WANG GuoJun college of Mathematics and Information science,shaanxi normal university,Xi’an 710062,china college of Mathematics and Information science Shaanxi Normal University Xi’an China

The present paper introduces the notion of the probabilistic truth degree of a formula by means of Borel probability measures on the set of all valuations,endowed with the usual product topology,in classical two-valued propositional *** approach not only overcomes the limitations of quantitative logic,which require the probability measures on the set of all valuations to be the countably infinite product of uniform probability measures,but also remedies the drawback that probability logic behaves only *** is proved that the notions of truth degree,random truth degree in quantitative logic and the probability of formulas in probability logic can all be brought as special cases into the unified framework of the probabilistic truth *** quantitative logic and probability logic are *** also proves a one-to-one correspondence between deductively closed theories and topologically closed subsets of the space of all valuations,and a one-to-one correspondence between probabilistic truth degree functions and Borel probability measures on the space of all *** second part of the present paper proposes an axiomatic definition of the probabilistic truth degree,and it is finally proved that each probabilistic truth degree function is represented by a unique Borel probability measure on the space of all valuations in the way given in the first *** a theory which we call probabilistic and quantitative logic in the framework of classical propositional logic is established.

关键词： probabilistic truth degree finite separation property probability logic quantitative logic probabilistic and quantitative logic

randomization of classical inference patterns and its application

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science in china(Series F) 2007年第6期50卷 867-877页

作者： WANG GuoJun1,2 & HUI XiaoJing1,31 Institute of Mathematics, shaanxi normal university, Xi’an 710062, china 2 research Center for science, Xi’an Jiaotong university, Xi’an 71004., china 3.college of Mathematics and computer science, Yan’an university, 716000, china Institute of Mathematics Shaanxi Normal University Xi’an China research Center for science Xi’an Jiaotong University Xi’an China college of Mathematics and computer science Yan’an University China

By means of randomization, the concept of D-randomized truth degree of formulas in two-valued propositional logic is introduced, and it is proved that the set of values of D-randomized truth degree of formulas has no isolated point in [0,1]. The concepts of D-logic pseudo-metric and D-logic metric space are also introduced and it is proved that there is no isolated point in the space. The new built D-randomized concepts are extensions of the corresponding concepts in quantified logic. Moreover, it is proved that the basic logic connectives are continuous operators in D-logic metric space. Lastly, three different types of approximate reasoning patterns are proposed.

关键词： D-randomized mapping D-randomized truth degree D-similarity D-logic metric space approximate reasoning

Linear Maps preserving projections of Jordan products on the Space of Self-Adjoint Operators

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical research with Applications 2012年第2期32卷 235-240页

作者： Meifeng WANG,Guoxing JI college of Mathematics and Information science,shaanxi normal university,shaanxi 710062,{4. college of Mathematics and Information science Shaanxi Normal University Shaanxi 710062

Let Bs(H) be the real linear space of all self-adjoint operators on a complex Hilbert space H with dim H ≥ *** is proved that a linear surjective map on Bs (H) preserves the nonzero projections of Jordan products of two operators if and only if there is a unitary or an anti-unitary operator U on H such that (X)=λU XU,X∈Bs(H) for some constant λ with λ∈{1,1}.

关键词： self-adjoint operator Jordan product projection linear map.

ON FrACTAL MECHANISM OF COASTLINE-A Case Study of china

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical science 2002年第2期12卷 142-145页

作者： ZHU Xiao hua, WANG Jian(college of Geographical science,Nanjing normal university,Nanjing 210097,{4.) college of Geographical science Nanjing Normal University Nanjing 210097 college of Geographical science Nanjing Normal University Nanjing

MANDELBrOT enunciated the uncertainty of the length of a coastline in his paper"How long is the coastline of Britain?"published in "science" in 1967. The fractal concept was presented for the first time in that paper and has been applied to many fields ever since. According to the fractal theory and conditions of fractal research of coastline,the controls of faults and biologic function on the fractal character of coastline are preliminarily discussed on the basis of GIS in this paper . Finally,some significant conclusions are drawn:1)the faults control the basic trends of coastlines of two study areas;2)the fractal dimension of coastline of Taiwan is smaller than that of Changle-Lufeng,because the faults of Taiwan more intensely control the trend and fractal dimension of the coastline;3)the larger the fractal dimension of the faults or the major faults,the more the controlling effect of them on the trend and fractal dimension of coastline; 4.the larger fractal dimension of the coastline of Changle-Lufeng indicates that the biologic function intensely shapes the coastline. In a word,the controls of faults and biologic function on the fractal character of coastline are discussed with a case study of china in this paper,it can be seen that faults and biologic function both have influence over the trend and fractal dimension of coastline,the fractal mechanism of coastline of two study areas may be so.

关键词： fractal fractal dimension GIS faults biologic function coastline